code: def invoice_notification(body: InvoiceEvent):
      pass
  
file_path: fastapi/tests/test_sub_callbacks.py
imports: from typing import Optional
  from dirty_equals import IsDict
  from fastapi import APIRouter, FastAPI
  from fastapi.testclient import TestClient
  from pydantic import BaseModel, HttpUrl
label_desc: Use image node_id 1 for calling a global function with example usage: invoice_notification(body) without return types